CN107193079A - A kind of single-mode fiber of low attenuation large effective area - Google Patents
A kind of single-mode fiber of low attenuation large effective area Download PDFInfo
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- CN107193079A CN107193079A CN201710308059.0A CN201710308059A CN107193079A CN 107193079 A CN107193079 A CN 107193079A CN 201710308059 A CN201710308059 A CN 201710308059A CN 107193079 A CN107193079 A CN 107193079A
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- effective area
- optical fiber
- refraction
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- inner cladding
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
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Abstract
The present invention relates to a kind of single-mode fiber of low attenuation large effective area, include sandwich layer and covering, it is characterised in that described core radius r1For 5.2~6.5 μm, sandwich layer relative index of refraction Δ n1For 0.20%~0.30%, inner cladding is coated outside sandwich layer successively from inside to outside, pure silicon dioxide inner cladding, sink covering and surrounding layer, described inner cladding diameter r2For 8~10.5 μm, relative index of refraction Δ n2For 0.10%~0.05%；Described pure silicon dioxide inner cladding diameter r3For 9.5~14 μm, relative index of refraction Δ n3For 0.03%~0.03%；Described sagging cladding radius r4For 13~18 μm, relative index of refraction Δ n4For 0.50%~0.25；Described surrounding layer is pure silicon dioxide glassy layer.The present invention, which is used, mixes germanium, the core covering design of the codope of fluorine and alkali metal, viscosity is optimized, to reduce optical fiber attenuation performance；And core covering waveguiding structure is rationally designed, make optical fiber that there is larger effective area；The matching of inside of optical fibre viscosity and Stress match are balanced by pure silicon dioxide glass, further reduction decay.
Description
Technical field
The present invention relates to optical fiber transmission technique field, and in particular to a kind of single-mode optics with low attenuation large effective area
It is fine.
Background technology
With increasing rapidly for IP network data service, operator improves constantly for the demand of transmission capacity, in existing network
Single fiber capacity is gradually approaching limiting value 100Tbps.100G Transmission systems have started to enter the commercial first year.How to be passed in 100G
Further increase transmission capacity on the basis of defeated signal, be each system equipment business and operator's focus of attention.
In 100G and super 100G systems, receiving terminal uses coherent reception and Digital Signal Processing (DSP), Neng Gou
The dispersion and polarization mode dispersion (PMD) accumulated in electrical domain in the whole transmitting procedure of digital compensation；Signal is multiple by using polarization mode
With reducing the baud rate of signal with various high-order modulatings, such as PM-QPSK, PDM-16QAM, PDM-32QAM, even
PDM-64QAM and CO-OFDM.But high-order modulating is very sensitive to nonlinear effect, therefore to OSNR (OSNR)
Propose higher requirement.Low-loss large effective area fiber is introduced, raising OSNR can be brought for system and non-linear effect is reduced
The effect answered is when using high power density system, and nonlinear factor is excellent for assessing the systematic function that nonlinear effect causes
Bad parameter, it is defined as n2/Aeff.Wherein, n2 is the nonlinear refraction index of Transmission Fibers, AeffIt is the effective of Transmission Fibers
Area.Increase the effective area of Transmission Fibers, the nonlinear effect in optical fiber can be reduced.
The general single mode fiber of land Transmission system circuit is presently used for, only about 80 μm of its effective area2Left and right.And
In the long haul transmission system of land, higher is required to the effective area of optical fiber, general effective area is in 100um2More than.In order to
Reduction laying cost, reduces the use of repeater, in repeatless transmission system, such as undersea transmission system, transmission light as far as possible
Fine effective area is preferably in 130um2More than.However, at present in the design of the refractive index profile of large effective area fiber, often
Big effective area is obtained by increasing the diameter for the optical core layer for being used to transmit optical signal.Such scheme exists certain
Design difficulty.On the one hand, the sandwich layer of optical fiber and its close covering mainly determine the basic performance of optical fiber, and in fiber manufacturing
Larger proportion is occupied in cost, if the radial dimension of design is excessive, the manufacturing cost of optical fiber will necessarily be improved, optical fiber is raised
Price, by as the commonly used obstacle of this type optical fiber.On the other hand, compared to general single mode fiber, the increasing of optical fiber effective area
Greatly, the deterioration of some other parameter of optical fiber can be brought：Such as, fiber cut off wavelength can increase, difficult if cutoff wavelength is excessive
To ensure the single mode of optical fiber optical signal in transmission wave band；If in addition, Refractive Index Profile of Optical design is improper, can also lead
Cause the deterioration of the parameters such as bending property, dispersion.
The optic fibre characteristic of another limitation long range high capacity transmission is exactly to decay, current conventional G.652.D optical fiber
Decay is general, and in 0.20dB/km, laser energy is gradually reduced after being transmitted through long-distance, so needing the form using relaying
Signal is amplified again.And the relative cost with optical fiber cable, relay station relevant device and maintenance cost are in whole chain-circuit system
More than 70%, if so being related to a kind of low decay or ultralow attenuating fiber, it is possible to effectively extend transmission distance, subtract
It is few to build and maintenance cost.By correlation computations, if the decay of optical fiber is reduced into 0.16dB/km, whole link from 0.20
Construction cost by overall reduction 30% or so.
In summary, a kind of low attenuation large effective area optical fiber of exploitation design turns into an important class of optical fiber fabrication arts
Topic.Document US2010022533 proposes a kind of design of large effective area fiber, and in order to obtain lower Rayleigh coefficient, it is adopted
With the design of pure silicon core, the codope of germanium and fluorine is not carried out in the core, and its design is made using the silica of fluorine doped
For surrounding layer.For the design of this pure silicon core, it requires that inside of optical fibre must carry out the viscosity matching of complexity, and requires drawing
Extremely low speed is used during silk, it is to avoid high-speed wire-drawing causes decay increase, manufacturing process caused by the defect of inside of optical fibre
It is extremely complex.
Document EP2312350 proposes a kind of large effective area fiber design of non-pure silicon core design, and it uses stepped
The cladding structure that sink is designed, and has a kind of design to use pure silicon dioxide outsourcing Rotating fields, and correlated performance can reach big effective
The requirement of area fiber G.654.B with D.But the clad section maximum radius of Fluorin doped is 36 μm in its design, although can be with
Ensure that the cutoff wavelength of optical fiber is less than or equal to 1530nm, but influenceed by its smaller Fluorin doped radius, optical fiber it is microcosmic and grand
See bending property to be deteriorated, so during optical fiber cabling, decay can be caused to increase, related bending is not referred in its document yet
Performance.
Document CN10232392A describes a kind of optical fiber with more large effective area.The invention optical fiber it is effective
Although area has reached 150 μm2More than, but because employ the sandwich layer design that conventional germanium fluorine is co-doped with mode, and by sacrificial
What the performance indications of domestic animal cutoff wavelength were realized.It allows cable cut-off wavelength in more than 1450nm, in its described embodiment,
Cabled cutoff wavelength has been even up to more than 1800nm.Among practical application, too high cutoff wavelength is difficult to ensure that optical fiber exists
Ended in application band, it is in single mode in transmission that just can not ensure optical signal.Therefore, the type optical fiber in the application may be used
A series of practical problems can be faced.In addition, in embodiment cited by the invention, sink cladding outer diameter r3Minimum 16.3 μm,
It is equally bigger than normal.The invention is no can be in optical fiber parameter (e.g., effective area, cutoff wavelength etc.) and fiber manufacturing cost
Obtain optimum combination.
One kind is proposed in document US6917740 and obtains the improved Pure Silica Core Fiber of performance using viscosity B coefficent.It is in core
Adulterate substantial amounts of F and Cl in layer, make use of contribution of the F and Cl doping to sandwich layer viscosity, fiber Rayleigh coefficient is reduced, described in text
Optical fiber is not without reference to having Ge doping in Section Design, and sandwich layer.
Document CN201410633787.5 discloses a kind of design of ultralow attenuating fiber, due in order to realize ultralow decay
Employ less Ge-doped in performance, fibre profile design center core layer, fibre profile employs Multi-layer design, and manufacture craft is multiple
It is miscellaneous.
Document CN201510464355.0 discloses a kind of design of ultralow attenuation large effective area optical fiber, and it is in sandwich layer
Position has carried out not having alkali-metal-doped in alkali-metal-doped, inner cladding；Without Related Component composition is announced in its inner cladding, no
It is related to the fluorin-doped design of germanium；And its Section Design and each covering part composition are not announced.
From analysis above, we it can be found that existing prepare low decay greatly using non-pure silicon core and part Fluorin doped covering
The feasibility of effective area optical fiber.But influenceed by factor noted earlier, how under such design, control optical fiber
Optical parametric, is our facing challenges.
Because if using the pure silicon dioxide without Fluorin doped as outsourcing layer, 3 problems can be faced.
First, suppress basic mode cut-off：Outsourcing layer and core material refractive index difference are too small, and optical fiber basic mode can be caused to let out
Dew, so as to influence the decay of optical fiber.So using the non-ultralow attenuating fiber for mixing the design of F outsourcing layers, it is necessary in surrounding layer
With sandwich layer centre position, designed by rational fibre profile, suppress basic mode leakage.
Second, it is considered to which viscosity is matched：If not doing any viscosity optimization design in outsourcing layer, its viscosity is with
Fall into inner cladding, inner cladding, sandwich layer viscosity gradient mismatch, it will influence optical fiber attenuation.
3rd, it is considered to which optical cross-sectional is matched：If using pure silicon dioxide glass as outsourcing layer, considering to be responsible for
During viscosity matched design, the concentration of various pieces doping is just defined, and G654 optical fiber is met in order to demonstrate,prove the optical parametric of optical fiber
Parameter request, that is, ensure the MFD of optical fiber, dispersion and bending property meet standard requirement, require that we must take into consideration optics again
Section Design.This requires us, when carrying out viscosity design, to consider the optical design of optical fiber, adds technique realization
Difficulty.
The content of the invention
It is below the definition of some terms being related in the present invention and explanation：
Relative index of refraction Δ ni：
Counted since fiber core axis, according to the change of refractive index, that layer being defined as near axis is optical fiber
Sandwich layer, the outermost layer of optical fiber is that pure silicon dioxide layer is defined as optical fiber jacket.
Each layer relative index of refraction Δ n of optical fiberiDefined by below equation,
Wherein niFor the refractive index of optical fiber each position glass, and ncFor the refraction of cladding refractive index, i.e. pure silicon dioxide
Rate.
Fiber core layer and the relative index of refraction contribution amount Δ F of inner cladding F dopingiDefined by below equation,
Wherein nFTo assume the F dopants of sandwich layer or inner cladding position, the pure dioxy without other dopants is being doped to
In SiClx glass, cause the variable quantity of silica glass refractive index, wherein ncFor outermost cladding index, i.e. pure silicon dioxide
Refractive index.
The effective area A of optical fibereff：
Wherein, E is the electric field relevant with propagation, and r is the distance between axle center to Electric Field Distribution point.
Cable cut-off wavelength λcc：
Defined in IEC (International Electrotechnical Commission) standard 60793-1-44：Cable cut-off wavelength λccIt is optical signal in optical fiber
In have propagated and not be re-used as the wavelength that single mode signal is propagated after 22 meters.Test when need to by optical fiber around a radius
14cm circle, two radius 4cm circle obtains data.
The technical problems to be solved by the invention are intended to the deficiency existed for above-mentioned prior art, a kind of low decay of design
The single-mode fiber of large effective area, it decays low, effective area greatly, and low manufacture cost.
The technical scheme that the present invention is used by solution the problem of set forth above for：Include sandwich layer and covering, its feature
It is described core radius r1For 5.2~6.5 μm, sandwich layer relative index of refraction Δ n1For 0.20%~0.30%, sandwich layer is outer from interior
Inner cladding, pure silicon dioxide inner cladding, sagging covering and surrounding layer, described inner cladding diameter r are outwards coated successively2For 8~
10.5 μm, relative index of refraction Δ n2For -0.10%~0.05%；Described pure silicon dioxide inner cladding diameter r3For 9.5~14 μ
M, relative index of refraction Δ n3For -0.03%~0.03%；Described sagging cladding radius r4For 13~18 μm, relative index of refraction Δ
n4For -0.50%~-0.25；Described surrounding layer is pure silicon dioxide glassy layer.
By such scheme, described sandwich layer is the silica glass layer that germanium and fluorine and alkali metal are co-doped with, and fluorine is in sandwich layer
Relative index of refraction contribution amount Δ FcoreFor -0.12%~-0.04%, alkali metal content is 100~2000ppm.
By such scheme, described inner cladding is bag including the silica glass layer that germanium and fluorine and alkali metal are co-doped with, fluorine
The relative index of refraction contribution amount Δ F of layercoreFor -0.15%~-0.06%, alkali metal content is 50~1500ppm.
By such scheme, during the alkali metal in the sandwich layer and inner cladding is lithium, sodium, potassium, rubidium, caesium, francium alkali metal ion
One or more.
By such scheme, described pure silicon dioxide inner cladding is the pure silicon dioxide glass for not containing germanium or fluorine；It is described
Pure silicon dioxide inner cladding one-sided thickness be more than or equal to 1 μm.
By such scheme, the optical fiber is 100~140 μm in the effective area of 1550nm wavelength2。
By such scheme, the cabled cutoff wavelength of the optical fiber is equal to or less than 1530nm.
By such scheme, dispersion of the optical fiber at wavelength 1550nm is equal to or less than 23ps/nm*km, the optical fiber
Dispersion at wavelength 1625nm is equal to or less than 27ps/nm*km.
By such scheme, attenuation of the optical fiber at wavelength 1550nm is equal to or less than 0.184dB/km；In wavelength
Attenuation at 1550nm is equal to or less than 0.204dB/km.
The beneficial effects of the present invention are：1st, using mixing germanium, sandwich layer and the inner cladding design of the codope of fluorine and alkali metal,
Core covering viscosity is optimized, to reduce optical fiber attenuation performance；And rationally design core covering waveguiding structure, make optical fiber have compared with
Big effective area；2nd, inner cladding and sagging covering centre position devise the pure silicon dioxide inner cladding of rational width, purpose
It is to prevent alkali metal to be diffused into the higher sagging inner cladding region of Fluorin doped concentration, form metal fluoride crystallization, influence declines
Subtract；3rd, in pure silicon dioxide inner cladding both sides, doped layer reasonable in design, and inside of optical fibre is balanced by pure silicon dioxide glass
Viscosity is matched and Stress match, reduces inside of optical fibre defect, further reduction decay；4th, outermost outsourcing Rotating fields are employed
The design of pure silicon dioxide, reduces Fluorin doped glass proportion in a fiber, so as to reduce fiber manufacturing production cost.
Brief description of the drawings
The refractive index profile structure distribution figure of Fig. 1 one embodiment of the invention.
Embodiment
The present invention is explained in further detail with reference to embodiments.
Include and coat inner cladding outside sandwich layer and many cladding structures, sandwich layer successively from inside to outside, pure silicon dioxide inner cladding,
Sink covering, pure silicon dioxide surrounding layer, the silica glass that described sandwich layer and inner cladding are co-doped with for germanium fluorine and alkali metal
Layer, the surrounding layer is pure silicon dioxide glassy layer.Described core radius is r1, sandwich layer relative index of refraction is Δ n1, it is described interior
Cladding radius is r2, relative index of refraction is Δ n2；The pure silicon dioxide inner cladding diameter is r3, relative index of refraction is Δ n3；Institute
Sagging cladding radius is stated for r4, relative index of refraction is Δ n4；A diameter of 125 μm of surrounding layer, coat bilayer polymer purple outside optical fiber
Outer solidify coating.
Table one is classified as the refractive index profile parameter of the preferred embodiment of the invention, Δ FcoreThe folding adulterated for F in sandwich layer
Penetrate rate contribution amount；ΔFcladThe refractive index contribution amount adulterated for F in inner cladding；Table two passes for the light described in table one corresponding to optical fiber
Defeated characteristic.
The fibre profile parameter of table one, the embodiment of the present invention
The optical fiber parameter of table two, the embodiment of the present invention
Claims (9)
1. a kind of single-mode fiber of low attenuation large effective area, includes sandwich layer and covering, it is characterised in that described sandwich layer half
Footpath r1For 5.2~6.5 μm, sandwich layer relative index of refraction Δ n1Wrapped in being coated successively from inside to outside for 0.20%~0.30%, outside sandwich layer
Layer, pure silicon dioxide inner cladding, sink covering and surrounding layer, described inner cladding diameter r2For 8~10.5 μm, relative index of refraction
Δn2For -0.10%~0.05%；Described pure silicon dioxide inner cladding diameter r3For 9.5~14 μm, relative index of refraction Δ n3
For -0.03%~0.03%；Described sagging cladding radius r4For 13~18 μm, relative index of refraction Δ n4For -0.50%~-
0.25；Described surrounding layer is pure silicon dioxide glassy layer.
2. the single-mode fiber of the low attenuation large effective area as described in claim 1, it is characterised in that described sandwich layer be germanium and
The silica glass layer that fluorine and alkali metal are co-doped with, relative index of refraction contribution amount Δ F of the fluorine in sandwich layercoreFor -0.12%~-
0.04%, alkali metal content is 100~2000ppm.
3. the single-mode fiber of the low attenuation large effective area as described in claim 2, it is characterised in that described inner cladding is germanium
The silica glass layer being co-doped with fluorine and alkali metal, relative index of refraction contribution amount Δ F of the fluorine in inner claddingcoreFor -0.15%
~-0.06%, alkali metal content is 50~1500ppm.
4. the single-mode fiber of the low attenuation large effective area as described in Claims 2 or 3, it is characterised in that described alkali metal is
One or more in lithium, sodium, potassium, rubidium, caesium, francium alkali metal ion.
5. the single-mode fiber of the low attenuation large effective area as described in claim 1 or 2, it is characterised in that described pure titanium dioxide
Silicon inner cladding one-sided thickness is more than or equal to 1 μm.
6. the single-mode fiber of the low attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber exists
The effective area of 1550nm wavelength is 100~140 μm2。
7. the single-mode fiber of the low attenuation large effective area as described in claim 1 or 2, it is characterised in that the stranding of the optical fiber
Cutoff wavelength is equal to or less than 1530nm.
8. the single-mode fiber of the low attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber is in wavelength
Dispersion at 1550nm is equal to or less than 23ps/nm*km, and dispersion of the optical fiber at wavelength 1625nm is equal to or less than
27ps/nm*km。
9. the single-mode fiber of the low attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber is in wavelength
Attenuation at 1550nm is equal to or less than 0.184dB/km；Attenuation at wavelength 1550nm is equal to or less than 0.204dB/km.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107678087A (en) * | 2017-11-07 | 2018-02-09 | 长飞光纤光缆股份有限公司 | A kind of low attenuation large effective area single-mode fiber |
| CN109839694A (en) * | 2017-11-27 | 2019-06-04 | 中天科技精密材料有限公司 | A kind of cutoff wavelength displacement single mode optical fiber |
| CN110780379A (en) * | 2019-10-29 | 2020-02-11 | 长飞光纤光缆股份有限公司 | Low dispersion single mode optical fiber |
| WO2023054620A1 (en) * | 2021-10-01 | 2023-04-06 | 古河電気工業株式会社 | Optical fiber and manufacturing method thereof |
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| CN104991306A (en) * | 2015-07-31 | 2015-10-21 | 长飞光纤光缆股份有限公司 | Ultra-low attenuation bend-insensitive single-mode fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107678087A (en) * | 2017-11-07 | 2018-02-09 | 长飞光纤光缆股份有限公司 | A kind of low attenuation large effective area single-mode fiber |
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| US11550098B2 (en) | 2019-10-29 | 2023-01-10 | Yangtze Optical Fibre And Cable Joint Stock Limited Company | Low-dispersion single-mode optical fiber |
| WO2023054620A1 (en) * | 2021-10-01 | 2023-04-06 | 古河電気工業株式会社 | Optical fiber and manufacturing method thereof |
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